The Oct. 26 deadline was set in 1992, when Congress passed the JFK Assassination Records Collection Act. As president, Trump is the only person who can block the release if he deems it a risk to security, intelligence or diplomacy.

The remaining files include more than 3,000 documents never seen by the public, as well as more than 30,000 files that were previously released with redactions.

The files reportedly may include a CIA personality study of Lee Harvey Oswald, testimonies from former CIA officers, letters from then-FBI Director J. Edgar Hoover, as well as files on other suspected players in the assassination.